Note: With the RHEL 7.3 release, the Systemd init system is able to use aliases. For example, the nfs.service is a symbolic link/alias to the nfs-server.service service file. This enables, for example, using the systemctl status nfs.service command instead of systemctl status nfs-server.service.
Previously, running the systemctl enable command using an alias instead of the real service name failed with an error.

Edit the /etc/exports file and add the following lines with the name (or IP address) of the client(s):

/shared client(rw,no_root_squash)

Export the directories:

# exportfs -avr
# systemctl restart nfs-server

Note1: The client needs to have access to the same group (via LDAP) and be a member of this group.
Note2: The last command shouldn’t be necessary in the future. But, for the time being, it avoids rebooting.